we learned today former nfl star linebacker, junior seau, who committed suicide at the age of 43 last may had the same brain condition diagnosed in at least two former nfl players who also took their own lives. seau's family asked that his brain tissue be analyzed after his death. test results from the national institutes of health show he had a brain disease called cte, caused by repeated blows to the head. symptoms can include memory loss, aggression and depression. >>> now to a life or death struggle that has captured attention around the world. 11 whales trapped under the ice, running out of breathing room. and just as a rescue mission was ramping up, something unexpected took place. it's all happening way up in remote northern quebec. and nbc news chief environmental affairs correspondent anne thompson has our report. >> this is a scene of beauty and bewilderment. the ocean's top predators, killer whales, fighting to breathe in canada's hudson bay. this pod of orcas has become an internet and international sensation. watching whales that can grow to 8 tons, taking turns coming up